# i vs Valve PPM

The clearest difference is review sentiment: Valve PPM at 100% against i's 0%. Valve PPM also leads on rating (5.0 vs 3.4). i's advantage is iOS requirement (10.0 vs 15.1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Valve PPM holds the better App Store score, 5.0 against 3.4. Both are backed by a comparable volume of ratings — 7 and 3 respectively. Written reviews point the same way: 0% of i's written reviews are positive against 100% of Valve PPM's.

i ships an update every 4 months, Valve PPM every 2 months. The most recent releases landed on September 21, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | i | Valve PPM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (7 ratings)](https://appshunter.io/ios/app/i-perfuse/id817922451/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/valve-ppm/id1604258260/reviews)** |
| Number of ratings | **7** | 3 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 31 MB | 37 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Courtland Menke](https://appshunter.io/developer/817922454) | [KRUTSCH](https://appshunter.io/developer/1454678018) |

## What reviewers say

### i

[App page](https://appshunter.io/ios/app/i-perfuse/id817922451)

This medical app assists clinical perfusionists and students with cardiac surgery calculations. It offers tools for patient volume, flow rates, drug information, and quizzes. Access common equations and perfusion news within the app.

**Highlights:** Adult and Pediatric Calculators, SVR and PVR Calculator, Oxygen Delivery and Consumption Calculator, Pediatric Cannula Recommendations, Searchable Drug Database, Multiple Choice Quiz, Common Equations and Normal Values

**Features:** macOS Compatibility

**In-app purchases:** none


### Valve PPM

[App page](https://appshunter.io/ios/app/valve-ppm/id1604258260)

This tool assists medical professionals in assessing implanted prosthetic cardiac valves. It offers guidance for checking existing valve function and selecting the optimal valve before implantation based on patient and prosthesis parameters.

**Highlights:** Assess implanted valve function, Select optimal valve before implantation, Analyze patient and prosthesis parameters, Identify potential patient-prosthesis mismatch, Determine intrinsic prosthesis dysfunction

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is i free?

i is free to download, with no in-app purchases.

### Is Valve PPM free?

Valve PPM is free to download, with no in-app purchases.

### Which has better reviews, i or Valve PPM?

Valve PPM is rated higher. i averages 3.4 out of 5 from 7 ratings, while Valve PPM averages 5.0 from 3 ratings.

### Do i or Valve PPM have ads?

Neither i nor Valve PPM shows ads.

### Which is updated more often, i or Valve PPM?

i ships an update every 4 months, and Valve PPM every 2 months. Most recently, i was updated on September 21, 2026 and Valve PPM on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*